ID A0A0A0ELK0_9RHOB Unreviewed; 358 AA.
AC A0A0A0ELK0;
DT 07-JAN-2015, integrated into UniProtKB/TrEMBL.
DT 07-JAN-2015, sequence version 1.
DT 27-MAR-2024, entry version 43.
DE RecName: Full=GTP cyclohydrolase-2 {ECO:0000256|HAMAP-Rule:MF_00179};
DE EC=3.5.4.25 {ECO:0000256|HAMAP-Rule:MF_00179};
DE AltName: Full=GTP cyclohydrolase II {ECO:0000256|HAMAP-Rule:MF_00179};
GN Name=ribA {ECO:0000256|HAMAP-Rule:MF_00179};
GN ORFNames=ATO9_00705 {ECO:0000313|EMBL:KGM50062.1};
OS Pseudooceanicola atlanticus.
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Rhodobacterales;
OC Paracoccaceae; Pseudooceanicola.
OX NCBI_TaxID=1461694 {ECO:0000313|EMBL:KGM50062.1, ECO:0000313|Proteomes:UP000030004};
RN [1] {ECO:0000313|EMBL:KGM50062.1, ECO:0000313|Proteomes:UP000030004}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=22II-s11g {ECO:0000313|EMBL:KGM50062.1,
RC ECO:0000313|Proteomes:UP000030004};
RX PubMed=25663028; DOI=10.1007/s10482-015-0398-2;
RA Lai Q., Li G., Liu X., Du Y., Sun F., Shao Z.;
RT "Pseudooceanicola atlanticus gen. nov. sp. nov., isolated from surface
RT seawater of the Atlantic Ocean and reclassification of Oceanicola
RT batsensis, Oceanicola marinus, Oceanicola nitratireducens, Oceanicola
RT nanhaiensis, Oceanicola antarcticus and Oceanicola flagellatus, as
RT Pseudooceanicola batsensis comb. nov., Pseudooceanicola marinus comb. nov.,
RT Pseudooceanicola nitratireducens comb. nov., Pseudooceanicola nanhaiensis
RT comb. nov., Pseudooceanicola antarcticus comb. nov., and Pseudooceanicola
RT flagellatus comb. nov.";
RL Antonie Van Leeuwenhoek 107:1065-1074(2015).
CC -!- FUNCTION: Catalyzes the conversion of GTP to 2,5-diamino-6-
CC ribosylamino-4(3H)-pyrimidinone 5'-phosphate (DARP), formate and
CC pyrophosphate. {ECO:0000256|ARBA:ARBA00043932, ECO:0000256|HAMAP-
CC Rule:MF_00179}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=GTP + 4 H2O = 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-
CC pyrimidine + formate + 3 H(+) + 2 phosphate; Xref=Rhea:RHEA:23704,
CC ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:15740,
CC ChEBI:CHEBI:37565, ChEBI:CHEBI:43474, ChEBI:CHEBI:58614; EC=3.5.4.25;
CC Evidence={ECO:0000256|ARBA:ARBA00029293, ECO:0000256|HAMAP-
CC Rule:MF_00179};
CC -!- COFACTOR:
CC Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00179};
CC Note=Binds 1 zinc ion per subunit. {ECO:0000256|HAMAP-Rule:MF_00179};
CC -!- PATHWAY: Cofactor biosynthesis; riboflavin biosynthesis; 5-amino-6-(D-
CC ribitylamino)uracil from GTP: step 1/4. {ECO:0000256|ARBA:ARBA00004853,
CC ECO:0000256|HAMAP-Rule:MF_00179}.
CC -!- SIMILARITY: Belongs to the GTP cyclohydrolase II family.
CC {ECO:0000256|HAMAP-Rule:MF_00179}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:KGM50062.1}.
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DR EMBL; AQQX01000001; KGM50062.1; -; Genomic_DNA.
DR RefSeq; WP_043743739.1; NZ_CP051248.1.
DR AlphaFoldDB; A0A0A0ELK0; -.
DR STRING; 1461694.ATO9_00705; -.
DR eggNOG; COG0807; Bacteria.
DR OrthoDB; 9793111at2; -.
DR UniPathway; UPA00275; UER00400.
DR Proteomes; UP000030004; Unassembled WGS sequence.
DR GO; GO:0005525; F:GTP binding; IEA:UniProtKB-KW.
DR GO; GO:0003935; F:GTP cyclohydrolase II activity; IEA:UniProtKB-UniRule.
DR GO; GO:0008270; F:zinc ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0009231; P:riboflavin biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd00641; GTP_cyclohydro2; 1.
DR Gene3D; 3.40.50.10990; GTP cyclohydrolase II; 1.
DR HAMAP; MF_00179; RibA; 1.
DR InterPro; IPR032677; GTP_cyclohydro_II.
DR InterPro; IPR000926; RibA.
DR InterPro; IPR036144; RibA-like_sf.
DR NCBIfam; TIGR00505; ribA; 1.
DR PANTHER; PTHR21327:SF18; 3,4-DIHYDROXY-2-BUTANONE 4-PHOSPHATE SYNTHASE; 1.
DR PANTHER; PTHR21327; GTP CYCLOHYDROLASE II-RELATED; 1.
DR Pfam; PF00925; GTP_cyclohydro2; 1.
DR PIRSF; PIRSF001259; RibA; 2.
DR SUPFAM; SSF142695; RibA-like; 1.
PE 3: Inferred from homology;
KW GTP-binding {ECO:0000256|ARBA:ARBA00023134, ECO:0000256|HAMAP-
KW Rule:MF_00179};
KW Hydrolase {ECO:0000256|ARBA:ARBA00022801, ECO:0000256|HAMAP-Rule:MF_00179};
KW Metal-binding {ECO:0000256|HAMAP-Rule:MF_00179};
KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Reference proteome {ECO:0000313|Proteomes:UP000030004};
KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Zinc {ECO:0000256|HAMAP-Rule:MF_00179}.
FT DOMAIN 171..334
FT /note="GTP cyclohydrolase II"
FT /evidence="ECO:0000259|Pfam:PF00925"
FT ACT_SITE 290
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT ACT_SITE 292
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 213..217
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 218
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 229
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 231
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 234
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 256..258
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 278
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 313
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 318
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
SQ SEQUENCE 358 AA; 38426 MW; 00ABF53C5B02AA07 CRC64;
MSLTPDANEQ LARARADLRI GLPVVLRDGA RQLLCLAVET LSPERMAALA VLGGTPHLVI
TSRRAETLKA RAYDGDLARI VLPRDADLTW LNAVADPADD LRAPMKGPFN ALRDGPADLD
RLALRILKSA RLLPAALVLP VATAPEGLTV LNAQPTRHVL DTSSPLHPVI SARVPLAAAE
NSRLHVFRPE DGGEEHYAIE IGRPPRDAPV LARLHSACFT GDLLGSLKCD CGPQLRGALA
QMGAEGAGVL LYLNQEGRGI GLANKMRAYS LQDQGFDTVE ANHRLGFEDD ERDFRLGAAL
LQKMGFSSAR LLTNNPAKIA MMERAGIAVT ERVPLKVGEN PHNAHYLATK AAKSGHLL
//
